Abstract
This paper summarizes the results of the full-scale tests on beam-to-column joints, carried out within the experimental program of the COPERNICUS European research project at the “Politehnica” University of Timisoara, Romania. Two series of six double-sided joints with three different beam-to-column connection typologies have been tested under symmetrical and antisymmetrical cyclic loading. Three types of connections (extended end plate, welded, and with cover plates) have been investigated. The main parameters considered in this study are: (1) initial stiffness; (2) moment capacity; and (3) plastic rotation capacity. The obtained experimental values are compared to the theoretical predictions by means of Eurocode 3, Annex J. The antisymmetrical loading triggers the participation of the panel zone to plastic mechanism, which brings the following changes as compared to the symmetrical loading: (1) Increase of ductility; (2) decrease of moment capacity and initial stiffness; and (3) more stable energy dissipation through hysteretic loops. In any of the loading cases, the quality of welds is essential for appropriate cyclic behavior of the joints.
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